Rock-drill.



E. IVI. MACKIE & P. P. DOYLE.

ROCK DRILLx APPLICATION FILED APE.14. 1910.

Patented 0G13. 22, 1912.

,a citizen of the United States, 'residing at Franklin, Venango Pennsylvania, but now mixing with the starren sfrnfriis rdn-grani serien.

EDVIIN M.l MACKIE, Ol? CHICAGO, ILLNOIS, AND PERCIVAL IE".` DOYLE, 0F FRANKLH, PENNSYLVANIA, ASSIGNORS TO CHICAGO PNEUMATIC TOOL COMPANY, 0F CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

ROCK-DRILL.

ramasse.

Speciiicaton of Letters Patent.

Patented oct. 2a, raie.

Original application led lJanuary 19, 1909, Serial No. 473,149. Divided and this application led April 14, 1910. serial No. 555,348;

-To all whom it may concern.'

EDWIN M. MACKIE, formerly county, residing at Chicago,

vCook county, Illinois, and PiinoivAL Dormi, a citizen of the Dominion of Canada, residing at said Franklin, have invented certain new and useful Improvements in Be it known that We,

'Rock-Drills, of which vthe following is a specification forming part of an application divisional of .an original application filed on January 19, 1909, Serial No. 473,149, for improvements in rock-drills.

Ouii invention relates to rock drills, more particularly those of the type known as hammer drills and the object thereof is, in

general, to improve the construction and op' eration of such drill.

The particular object of our invention is to provide novel and eiiicient means for supplying Water, or Water 'and air, to the st-riking piece and also to the drill steel, so that the water or the air and water may be forced through such drill steel and out of the' same at its cutting end to thoroughly clean the hole of cuttings,thus enabling the machine to drill faster and to keep the cutting end of the drill steel cool in order that it may retain its temper. Furthermore, such supplying of water, or water and air, willprevent sticking of tliesteelsl and will also prevent dust'from the drilling atmosphere which the operators have tol breathe and will consequently protect them. from contracting what is known as miners phthisis. l

Other novel and advantageous features of construction and operation will be apparent from the description hereinafter given.

lin the drawing Figure 1 is a plan view of our improved rock drill with our invention embodied therein; Fig. 2 a section thereof partly in elevation; and Figs. 3 and 4 cross-sections on the sectional lines 3--3 y and 4r4 respectively of Fig. 2.

Referring to the present embodiment of our invention, the elements of the hammer are f the usual construction, so that it will be suiicient to refer to them in general terms only. As shown in Fig. 2, the hammering piston 1 reciprocates in the cylinder 2, to which the -uid pressure is admitted and `.released by means'of the valve 3 working -in coperationwith the piston l, with the result that the piston will be reci ro,- cated in opposite directions and causeA to deliver its blow on its forward stroke, As shown the valve is adapted to operatein a suitable valve boxor bushing 4 whose4 front end is closed from the cylinder or piston chamber by means ofvthe valve box cap 5. p Y

.The drill is in the present instance pro.- vided with a front head 6 secured.V to the cylinder preferably by' a sl'vp joi t, to which end this headl is suitably machined on its upper end to form a ca for the lower end of the drill cylinder. Jhis front head,-as Well as the back head 7 which also has a slip joint connection with the cylinder, is rigidly held in position by means of the tie rods or bolts 8 which, serve to clamp such heads to each other and to the interposed cylinder. The interior of the upper end of the lower or fronthead is provided with a two diameter-bore in order to receive the striking piece 9 which is of corresponding two diameters. This strikingl piece is arranged to receive the blow of the hammering piston 1 and to transmit the same to the inner end of the drill steel ltlwhich is inserted in the front end of the front head 6 and' received by the chuck bushing 11. In

order to facilitate the removal of the chuck bushing the front headis slotted, as seen in Figs. 1 and 2 and provided with a clamping bolt 12 for clamping such head upon the bushing. Thisclamping bolt is adapted to lie in a depression formed on one side of the bushing, so as to prevent rotating. This front head forms a water head and to this end the same is provided with a water supply passage 13 communicate with a water supply extending longitudinally of the rill cylinthe latter froiiirA arranged to assage 14 der, the same being connected to any suitable source of water or both air and water controlled by suitable valve mechanism 15. In orderl to provide for aproper connection between the passages 13 and 14 and also to locate or determine the of the front head lan vide a hollow dowel the cylinder, we pro- 16 located at the joint roper relative position y is provided'with suitable packing 20, pref- AWater passage 13 vcornrnunicates vwith the" `cate with a common central passage 18. Thispassage inturnfis arranged to corn- `and 14, thence through the passages 17 and nninicate with a central passage v.19in the d'ill steel. In order to prevent leakage'oi"l the Huidaround the striking 'piece the saine,

erablyyleather, `and likewise for the same purpose the drill steel is provided with suitablefpacking Q1 arranged behind the chuck` bushing'll and around the inner' end of the drill steel, Under this construction and arrangement the Water or air and' Waterrniixed may* be admitted. through the passages 13 18 the strikingy piece, and finally through the passage v19 in= the drill steel. vto the cutting end of the latter, thereby obtaining in a novel and simple manner the advantages recited l the preamble of this specioation.

We do not herein claiin the feature of the I air feed device and the1 feature of the slip joint connections for the convenient dismantling or assembling of the machine inl asniuch'as the same forins the subject matter of the originalapplication, of which the Within application is divisional.

ln a rock drill, the combination, with a 3 vhainnier barrel or cylinder and its' piston and Valve, ,of a front head secured'to the ,y cylinder and vadapted to receive the Working tool, anda strikinglpiece located in said head and y'having Water passages, one of 4 'which is' adaptedto communicate with a l 'Water passagey in ythe Working tool, said front head having a Water supply passage to vsupply Water. tothe passages in the striking 'piece andthe cylinder, having a correspondf 4 ing Water passage, and, a hollow dowel y'or connecting the water passages at the juncy tion between the cylinder` and 'front'head and for .determining the proper relative position of such parts. f

y' EDWIN M. MACKIE.

PERCIVAL' F; DOYLE. lVit-nesses to the signature 0f Edwin M. Mackie B. E. ANDERSON,

LOUIS E. Eni/vin.y Vlitnesses to the signature of Percival F. Doyle: p

L. E HOFFMAN, V EL'MER A. LAWRENCE.

Copies ci this patent may be obtained for five cents each, by addressing the f Commissioner of Patents,

Washington, D. C. 

